I was in my first year of college, making friends and enjoying life, but then my whole world turned upside down. I had a heart attack. It felt like someone was stabbing (刺) me in the chest with a knife over and over again.

    After three months of rest I went back to college, but then things took a turn for the worse. I was staying at my Nana's house and woke up in the middle of the night with a terrible pain in my chest. I knew I was having a heart attack again.

    I couldn't even shout for help. Luckily my grandpa was going to the toilet and heard me falling out of bed. If it wasn't for him, I probably wouldn't be here.

    The two holes in my heart were causing the problems and I needed an operation immediately to repair them. Unfortunately, the surgery didn't go well and they only managed to repair one of the holes.

    When I woke up from the operation, I had a really dry mouth and couldn't wait to have something to eat and drink. The biggest shock of all came when I was told that I needed a heart transplant and was put on the register. The doctors were stunned at how quickly heart failure came on – it usually takes years, but it took my heart less than six months to get to that stage. My whole world came crashing down, but I stayed strong. It was a choice between crying every day and getting on with my life.

    As time went on, life became even harder. I hated feeling weak all the time and needing help with everything. It got to the point where I thought I would never get a new heart. I was diagnosed with depression.

    Even though I thought that Christmas 2008 would be my last, I really enjoyed it and even had a good New Year. Everyone was crying for me when the clock struck midnight and they told me to keep fighting.

    A week later, I got a call from the doctors saying they'd found a suitable donor (捐赠人). My wish came true and thankfully the operation went well. I spent four hours in surgery where they took out my old heart and put a new one in. When I woke up I burst out crying. I had a second chance at life.

    Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer. We visited the moon in our spaceship!

    Before we left, Li Yanping explained to me that the force of gravity would change three times on our journey and that the first change would be the most powerful. Then we were off. As the rocket rose into the air, we were pushed back into our seats because we were trying to escape the pull of the earth's gravity. It was so hard that we could not say anything to each other. Gradually the weight lessened and I was able to talk to him. "Why is the spaceship not falling back to the earth? On the earth if I fall from a tree I will fall to the ground." I asked. "We are too far from the earth now to feel its pull, " he explained, "so we feel as if there is no gravity at all. When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earth's. " I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.

    When we got there, I wanted to explore immediately. "Come on," I said. "If you are right, my mass will be less than on the earth because the moon is smaller and I will be able to move more freely. I might even grow taller if I stay here long enough. I shall certainly weigh less!" I laughed and climbed down the steps from the spaceship. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. "Oh dear," I cried, "walking does need a bit of practice now that gravity has changed." After a while I got the hang of it and we began to enjoy ourselves.

    When I was a boy, I was always happy to see those little brown coins. After years I was still very happy to pick up pennies on the ground, I usually saved them up. I usually bought a pack of gum or a bag or chips when it was enough. After growing up, I hears a story about coins. It was said that our loved people sometimes would leave pennies on the ground in front of us. People wanted to show us that we were loved and watched over kindly. I never doubted that story even as an adult. It is difficult for me to find a lot of money on the ground, but pennies are there all the time. Maybe that is why I still enjoy seeing them and picking them up, no matter how dirty or old they are.

A few months ago, I was walking to the local post office to mail a letter. As I entered the room, I saw not one, not two, but four pennies shining in the sunlight. I smiled and picked them up. I kept them in my hands as I walked in the post office. "Four is Ok," an office said to a lady. The lady began searching her purse. Her face went red. I understood what had happened. I laughed to myself at this surprising moment. I placed my pennies on the desk before her. The smile I got in return was worth a thousand dollars.

    The coins weren't so valuable to me, but they did matter to her. I just performed a little kindness. I was happy.

    We want our children to succeed, in school and, perhaps even more importantly, in life. But the paradox(悖论) is that our children can only truly succeed if they first learn how to fail. Consider the finding that world-class figure skaters fall over more often in practice than low-level figure skaters. At first sight this seems contradictory. Why are the really good skaters falling over the most?

    The reason is actually quite simple. Top skaters are constantly challenging themselves in practice, attempting jumps that stretch their limitations. This is why they fall over so often, but it is precisely why they learn so fast. Lower-level skaters have a quite different approach. They are always attempting jumps they can already do very easily, remaining within their comfort zone. This is why they don't fall over. In a superficial sense, they look successful, because they are always on their feet. The truth, however, is that by never failing, they never progress.

    What is true of skating is also true of life. James Dyson worked through 5,126 failed prototypes(原型) for his dual cyclone vacuum before coining up with the design that made his fortune. These failures were essential to the pathway of learning. As Dyson put it: “You can't develop new technology unless you test new ideas and learn when things go wrong. Failure is essential to invention.”

    In healthcare, however, things are very different. Clinicians don't like to admit to failure, partly because they have healthy egos(自我)(particularly the senior doctors) and partly because they fear litigation(诉讼). The consequence is that instead of learning from failure, healthcare often covers up failure. The direct consequence is that the same mistakes are repeated. According to the Journal of Patient Safety, 400,000 people die every year in American hospitals alone due to preventable error. Until healthcare learns to respond positively to failure, things will not improve.

    But let us return to children. One of the major mistakes in education in the 1970s was the attempt to equip children with confidence by giving them lots of successes （setting the bar very low）. The consequence was that the ego of kids became bound up with success, and they became unable to take risks and collapsed as soon as they hit a proper challenge.

    We need to flip(翻转) this approach. In a complex world, failure is inevitable. It is those individuals and institutions that have the flexibility to face up to failure, learn the lessons and adapt which eventually excel(突出).

    John Winston Ono Lennon (9 October 1940-8 December 1980) was an English rock musician, singer, songwriter, artist and peace activist who gained worldwide fame as one of the founders of The Beatles. As a member of the group, Lennon was one of the leading singers and co-wrote most of the band's songs with bassist(低音歌手) Paul McCartney.

    In his singing career, Lennon wrote and recorded songs such as Give Peace a Chance and Imagine. Lennon showed his rebellious(反叛的) nature and cleverness on television, in films such as A Hard Day's Night, in his books such as In His Own Write, and in press conferences(新闻发布会) and interviews. He was controversial(有争议的) through his work as a peace activist, artist and author.

    Lennon had two sons: Julian Lennon, with his first wife Cynthia Lennon, and Sean Ono Lennon, with his second wife, avant-garde(前卫) artist Yoko Ono. After a retirement from 1976-1980, Lennon reemerged(再度出现) with a comeback album, but was killed one month later in New York City on 8 December 1980. In 2002, respondents to a BBC poll(投票) on the 100 Greatest Britons voted Lennon into the eighth place. In 2004, Rolling Stone magazine ranked Lennon number 38 on its list of "The Immortals(不朽的): The Fifty Greatest Artists of All Time" and ranked The Beatles number one.

    So often I hear people justify（为……辩解）their lack of family trips because their children are not old enough to remember them. This reason is so confusing to me. Who would travel based on another person's memory?

    Of course the kids aren't going to remember anything in infancy（婴儿期）, but you will. You will remember all the sweet memories you had with them.

    My parents would take me to Guatemala as a child. I don't remember a lot of the trip, but I do know that when I went back as a young adult, I felt comfortable in my surroundings. I didn't spend my time there discovering a new way of life. I spent the time having fun with my family. I love looking at pictures that we took together when I was my son's age. I don't remember them, but that's not the point. The point is, I was there with my family, and I know I was happy.

    Now that I'm a parent, I can't help but do the same. Last year, we took our 2-year-old son to Disney alongside his great-grandmother. His great-grandmother had recently begun to suffer from Alzheimer's. That trip was timed in the most magical way — right before my son was old enough to remember it and right before his great-grandmother began to forget. This makes me want to cry for them both. How did we get so lucky to have this moment to share with each other before big changes influenced our family forever?

    Realistically speaking, many families do not have the opportunity to travel internationally or visit pricey theme parks. I understand this more than you know, but I'm talking beyond that. They are young but these forgettable moments are still changing them. They will shape your child into who they will be tomorrow. The memories we absorb as their parents are also as influential as we have not finished learning our truths either.